In a bid to drum up investor appetite for rough, natural diamonds, mining company Lucara Diamond Corp and manufacturer HB Antwerp on Monday unveiled a 1 175-ct diamond in New York City.

The companies are billing the stone as the largest rough diamond to be shown in the United States, and the third-largest to be discovered. Reuters could not independently verify these claims.

HB Antwerp told Reuters it has yet to decide whether the uncut diamond will be cut into polished stones.